mathsurgery - Ratio and proportion

All
• Use sequences to scale numbers up or down; solve problems involving proportions of quantities (e.g. decrease quantities in a recipe designed to feed six people) (Y5)
• Solve simple problems involving direct proportion by scaling quantities up or down (Y6)

Most

• Communicate own findings effectively, orally and in writing, and discuss and compare approaches and results with others
• Understand the relationship between ratio and proportion; use direct proportion in simple contexts; use ratio notation, simplify ratios and divide a quantity into two parts in a given ratio; solve simple problems involving ratio and proportion using informal strategies

Some

• Refine own findings and approaches on the basis of discussions with others
• Apply understanding of the relationship between ratio and proportion; simplify ratios, including those expressed in different units, recognising links with fraction notation; divide a quantity into two or more parts in a given ratio; use the unitary method to solve simple problems involving ratio and direct proportion

Should we use proportion to determine the distance of a race?

On Your Mark from mathalicious on Vimeo.

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Ratio and proportion

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